Machine for making tablets.



P. J. HARRAH.

MACHINE FOR MAKING TABLETS.

APPLICATION FILED FEB. I8 1918.

1 ,288,78 Patented Dec. 24, 1918.

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P. J. H ARRAH.

MACHINE FOR MAKING TABLETS.

APPLICATION FILED FEB. 18 1918.

1,288,878. Patented Dec. 24, 1918.

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PHILIP J. HARRAH, OF BLOOMFIELD, INDIANA.

MACHINE FOR MAKING TABLETS.

Application filed February 18. 1918.

T 0 all whom it may concern.-

Be it known that I, PHILIP J. HARRAH, of Bloomfield, in the county of Greene and State of Indiana, have invented certain new and useful Improvements in Machines for Making Tablets; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My object is to improve this class of machines by rendering the adjustment of the parts independent so as to insure their proper successive action and to provide a machine of simple compact form.

Figure 1 is a perspective view showing a machine embodying my invention. Fig. 2 is an end view. Fig. 3 is a top plan and Fig. 41 a front elevation.

In the frame 1 is mounted a shaft 2 rotated by suitable gearing. This shaft carries three eccentrics 3, 41, 5. The shaft is capable of an upward yielding movement. The upper parts 6 of its bearings are movable against the tension of springs 7 between these bearing parts and the top of the frame.

In the base of the frame is the matrix disk 8 in which the tablets are formed, mounted to rotate on a pin 9. The disk has the usual notches 10 in its periphery and a series of pockets 12 in which the tablets are compressed. Beneath the disk the framebase has an orifice 13 with which the pockets are adapted to successively register and which communicates with an outlet chute. Powdered material, such as soap, is fed to the disk from a hopper 15.

The three steps of intermittently rotating the disk, compressing the tablet, and ejecting it, are eflected by independent means actuated, respectively, by eccentrics 3, 4c, 5.

The connection between eccentric 3 and the disk comprises a substantially vertically disposed rod 16 set back of the eccentric and fulcrumed at 16*. It is connected at its upper end with the eccentric by a pivoted link 17 and moves in a guide at its lower end. This guide is shown consisting of a pair of parallel bars 18 between and longitudinally of which rod 16 travels. A pawl Specification of Letters Patent.

Patented Dec. 24, 1918.

Serial No. 217,888.

19 on rod 16 successively engages the notches 10 in the disk and effects its partial rotation. By this means an accurate control of the intermittent movement of the disk is insured.

When the pawl has brought a pocket into proper position the plunger 20 actuated by eccentric 4 effects the compression of the material to form the tablet. In feeding the material it may happen that too much gets into the pocket. In this event as the compression is made the shaft 2 rises against the tension of springs 7 and thus produces the tablet of somewhat greater than normal thickness.

The means for ejecting the tablet is shown as a bell crank lever 21 fulcrumed in the frame and having a vertical plunger 22 pivoted to one arm and a link 23 secured to eccentric 5 pivoted to the other.

The successive actions occur in the order above stated and it will be understood that the plunger and ejector are inactive while the disk is being moved. An advantage of my structure is that it enables me to remove or alter any of the parts performing any one of the three functions without afiecting the others.

I claim as my invention:

1. In a machine for making tablets, a frame, a matrix disk rotatable in said frame, a shaft journaled in said frame, means operated by said shaft for successively turning said disk, compressing a tablet, and ejecting it, and means for permitting said shaft to rise under the compression action.

2. In a machine for making tablets, a frame, a matrix disk rotatable in said frame and having notches in its edges, a shaft journaled in said frame, an eccentric on said shaft, a vertical rod fulcrumed in the frame, a link pivotally connected to said rod and said eccentric, a guide comprising a pair of parallel bars betweenwhich the lower portion of said rod is movable, and a pawl carried by said rod and adapted to engage the notches of said disk.

In testimony whereof, I have signed this specification.

PHILIP J. HARRAH.

Copies of this patent may be obtained for flve cents each, by addressing the Commissioner of l'atente, Washington, D. Q. 

